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Grobag Guide

Choosing a size

An ideal time to start using a Grobag baby sleep bag is when your baby weighs more than 8.8 lbs (0-6 mths size). Your child's head should not be able to pass through the neck hole when the Grobag is fastened; otherwise the Grobag is too big. Remember to check the weight of your child.

Please remember that these are recommendations only as all babies are different.

Approximate child age

Minimum child weight

Maximum child length

0-6 months

4kg / 8.8lb

68cm / 27"

6-18 months

8.1kg / 18lb

86cm / 34"

18-36 month

11.4kg / 25lb

98cm / 39"

3-6 years

53.5cm chest

116cm / 46"

6-10 years

58cm chest

140cm / 55”

Choosing a tog

A tog measurement is a European warmth rating: the higher the tog, the warmer the product. Grobag baby sleep bags are available in four tog ratings.

A number of factors determine the tog rating of the baby sleep bag that should be used. These include the number of clothes your baby is wearing, the temperature of their bedroom and your baby's health.

Grobags come in a variety of warmth ratings (togs):

3.5 tog

Cold temperatures - for cold room temperatures of 12-15°C (54-59°F)

2.5 tog

All year round - for standard room temperatures of 16-20°C (61-68°F)

1.0 tog

Summer and daytime naps - warmer weather and in rooms of 21-23°C (69-74°F)

0.5 tog

Holiday and heatwaves - hot weather and very warm rooms of 24-27°C (75-81°F)

What to wear

Grobag Baby Sleep Bag is a wearable blanket that will keep your baby at a comfortable temperature all night long. The table below shows our guidance on the correct tog of Grobag and clothing to be used in different room temperatures.

Grobag Baby Sleep Bags are designed to be used instead of blankets and top sheets and you need to regularly check your baby to make sure he or she is not too hot or cold, as all babies are different..

Nursery Temperature

3.5 tog

2.5 tog

1.0 tog

0.5 tog

24-7°C(75-81°F)

Sleeveless bodysuit

23°C(74°F)

Short-sleeved bodysuit

21°C(69°F)

Long-sleeved bodysuit

20°C(68°F)

Long-sleeved bodysuit

Short-sleeved bodysuit and pyjama top

Under18°C (65°F)

Gro-suit

>Under16°C (61°F)

Gro-suit

Gro-suit and sleeveless bodysuit or short-sleeved bodysuit

Under14°C (57°F)

Gro-suit and sleeveless bodysuit or short-sleeved bodysuit

Styling features

Grobags come in a range of styles to suit your needs.

Side Zip

With double poppers on the shoulders, there are also under-arm poppers for when your baby is small. Opens out flat for easy night time nappy changes

Front Zip

Fixed shoulders are great if your child moves around more. Ideal for toddlers.

Travel Grobags

Like normal Grobags but with the extra feature of a two way front zip and a back vent so it can easily be used with a 5 point harness in car seats or pushchairs.

How to wash

All Grobag Baby Sleep Bags can be machine washed at 40°C. They can be hung out to dry or as long as it's not a Jacquard or Lightweave Grobag can be tumble dried on a low setting. As with all cotton goods, we have designed our Grobags to allow for up to 5% shrinkage. If your child has any allergies and you wish to wash your Grobag at 60°C, you should allow for a little more shrinkage. When washing, it is best to keep the zip closed. You can iron your Grobag on a low heat if desired, always keeping the iron away from the zip or covering the zip with a cloth. We recommend that you wash dark colours separately for the first few washes. We also recommend that you wash your Grobag with a detergent that is free from bleaching agents in order to retain the original colours.

Grobags FAQ

What is a Baby Sleep Bag?

A Baby Sleep Bag (or Baby Sleeping Bag) is a “wearable blanket” designed for babies to be used instead of traditional blankets and sheets. Baby Sleep Bags have a neck opening and armholes and are therefore “worn” by the baby to help the baby stay at the right temperature through the night without the problem of traditional blankets and sheets being kicked off or getting tangled up.

Are Baby Sleep Bags the same as Baby Sleeping Bags?

Yes. A new British Standard BS8510:2009 has recently been produced which has brought the newer term “Baby Sleep Bags” into more common usage. This is to avoid Baby Sleep Bags being confused with traditional camping sleeping bags. Baby Sleep Bags (formerly called Baby Sleeping Bags) are wearable blankets with armholes and neck openings and are therefore quite unlike camping sleeping bags.

Are Baby Sleep Bags safe?

Yes. Well fitting, low-tog Baby Sleep Bags, when used correctly, are potentially one of the safest forms of bedding for your baby. While the baby has complete freedom of movement within the Baby Sleep Bag, the fitted neck and armholes ensure that there is no danger of either slipping in or out, provided the baby is placed in the correct size of Baby Sleep Bag for his age/weight. Therefore, provided also that a suitable level of nightwear is worn, he can sleep safely at a pleasant and constant temperature throughout the night.

The Gro Company has conducted exhaustive research and product testing to ensure that all the components of our Grobag Baby Sleep Bags conform to the British Safety Standards and safety regulations. The National Standards Body of the UK has created a new standard BS8510:2009. Grobag Baby Sleep Bags are one of the first to achieve the new standard which further ensures all aspects of quality and safety.

Why should I use a Baby Sleep Bag instead of blankets and sheets?

They stop babies kicking off their covers, getting cold and waking themselves and everyone else up

They can’t be kicked over your baby’s head or get tangled up

They keep babies at a comfortable temperature all night long

Your baby can wake up, move around his cot, and fall back to sleep all on his own without you having to tuck them back in

They become a great part of the bedtime routine, and will help your baby feel familiar, secure and confident and understand when it's time for bed, even when away from home

They can help the transition from Moses basket to cot by being the familiar “comforter” in both

They may delay the age at which your baby rolls over onto his tummy

They may delay the age at which your baby is able to climb out of his cot.

What should my baby wear under a Grobag Baby Sleep Bag?

What your baby wears will depend on the tog of Grobag Baby Sleep Bag and the temperature of your baby's bedroom. (In the same way as you would adjust nightclothes and number of blankets). As a guide, please refer to the table below. Please remember, though, that babies are all different and, just as with blankets and sheets, you will soon discover what your baby is most comfortable wearing. Placing your fingers on your baby’s chest is the best indicator of whether they are too hot/too cold/just right as babies’ hands often feel cool.

Which weight of Grobag Baby Sleep Bag should I buy?

Our 2.5 tog Grobag Baby Sleep Bags are ideal for Autumn, Winter and Spring and can be used right up until the Summer nights become warm. If your nursery is usually below 20°C, we recommend a 2.5 tog Grobag. However, if you live in a particularly mild region or if you have well insulated and heated accommodation and your nursery is usually 21°C or above, you may prefer a 1.0 tog Grobag for year round use. Our 1.0 tog Grobags are ideal for use from during the Summer months when the nights are warmer and are also very useful in early Spring and Autumn for day-time naps whilst your baby is still in a 2.5 tog Grobag at night. 0.5 tog Grobag Baby Sleep Bags are for use in high Summer, for holidays abroad, or if your child is unwell and has a raised temperature.

Why only 2.5 togs when my Winter weight duvet is 12 togs?

Health professional guidelines recommend that Baby Sleep Bags should be ‘lightweight'. Our own research and our mounting body of "parent testimonials" confirm that our 2.5 Tog Grobag Baby Sleep Bags are ideal for the UK climate and for the recommended nursery temperatures of 16°C to 20°C. A Baby Sleep Bag surrounds the baby, providing insulation from both below and above, and also a warm pocket of air around the baby.

Because of the low tog rating, Grobag Baby Sleep Bags also provide great versatility throughout the year, simply by adjusting the level of your baby’s nightwear. When the weather is very cold, simply add more clothing (this could include a sleepsuit, socks and even a cardigan). When the weather is warmer, or perhaps if your child is unwell, you can remove layers of clothing while still keeping your baby at the right temperature.

Remember: never use a duvet or quilt with a Baby Sleep Bag.

What does the TOG rating mean?

The Tog rating describes the warmth or "Thermal Resistance" of a product and is widely used in the UK to explain warmth levels of duvets. Grobag Baby Sleep Bags are tog tested to conform to BS4745:1990 and to the new British Standard BS 8510:2009. Latest advice from Health professionals is that Baby Sleep Bags should be ‘lightweight' and to meet the new British Standard, Baby Sleep Bags must be between 2.0 and 3.5 togs for temperatures between 10°C and 20°C. This is why our main range of Grobags are 2.5 togs for the recommended ideal nursery temperature range of 16°C and 20°C.

What is the best room temperature for my baby?

The Lullaby Trust and Health Professionals recommend that the ideal room temperature for your baby is between 16°C and 20°C, and ideally at 18°C/65°F. Our 2.5 tog Grobag Baby Sleep Bags are designed to be used in this temperature range. If the nursery is warmer or colder, simply adjust the level of clothing your baby is wearing. During summer months, or in warmer climates, if your baby’s nursery is above 20°C and we recommend using our 100% cotton 1.0 tog or 0.5 tog Grobags.

Many people ask us how to keep the nursery at around 18°C in the winter, without having to have the central heating going all night! We recommend an inexpensive small thermostatically controlled heater which is available from all good electrical or DIY outlets. Position it well away from your baby’s cot and out of reach of your baby, and adjust it to come on just whenever needed in order to maintain the ideal room temperature, thus saving time and money turning on and off all the radiators. (Remember to remove the heater once your child can climb out of his cot).

We also provide a FREE nursery thermometer with every Grobag to help you monitor the temperature of your baby's bedroom.

What should I do if my baby gets too cold or too hot?

If your baby has woken up because he is too cold, pick him up & adjust either the temperature of the room, or the baby's clothing. You can cuddle your baby in his Grobag to warm him up again before putting him back, warm and cosy in his cot. If your baby feels hot, you should cool him down by removing some clothing, then either adjust the temperature of the bedroom or the clothes your baby is wearing before returning him to his cot.

Is there any danger that my baby could become too hot in a Grobag Baby Sleep Bag?

Provided you follow the guidelines on your nursery thermometer (provided FREE with every Grobag Baby Sleep Bag), there should be no danger of your baby over-heating. Always keep your baby’s head uncovered. It is safest to use a Baby Sleep Bag without sleeves and never use any clothing or bedding with a hood attached. Decrease the level of nightclothes and bedding if your baby is unwell and has a raised temperature. If you are in any doubt, please consult a Health Professional.

What size Grobag Baby Sleep Bag should I buy?

Our 0-6 month size Grobag Baby Sleep Bag is suitable from birth if your baby weighs 8.8lb (4kg)or more or from when your baby reaches this weight. It will last until your baby is 6 months old and may well last longer.

The 6-18 month size is suitable from when your baby is 18lb (8.1 kg) and is generously sized so may easily last until your baby is between 18 and 24 months.

Our 18-36 month size is suitable from when your toddler weighs 25lb (11.4kg) and many toddlers are still wearing their Grobags well after the age of 3.

We also make 3-6 year Grobags and even 6-10 year Grobags.

How many Grobag Baby Sleep Bags should I buy?

As the larger sizes last for at least a year, we recommend you buy at least 2 Grobags (so you will always have a spare one if you suddenly need one in the middle of the night!).

Why don't Grobag Baby Sleep Bags have sleeves?

We believe that Baby Sleep Bags should be sleeveless to aid heat loss and air circulation. (Babies sleeping under traditional blankets rarely sleep with their arms inside). The new British Standard also stipulates that Baby Sleep Bags should be “without sleeves or hoods”. In cooler weather, we recommend long-sleeve bodysuits, in addition to a long-sleeved pyjama top, pyjamas or a sleepsuit.

How do I wash my Grobag Baby Sleep Bag?

All Grobag Baby Sleep Bags can be machine washed at 40°C. They can be hung out to dry or tumble dried on a low setting. As with all cotton goods, we have designed our Grobags to allow for up to 5% shrinkage. If your child has any allergies and you wish to wash your Grobag at 60°C, you should allow for a little more shrinkage. In general, think environment – if not dirty wash at 30°C!

When washing, it is best to keep the zip closed. You can iron your Grobags on a low heat if desired, always keeping the iron away from the zip or covering the zip with a cloth.

We recommend that you wash dark colours separately for the first few washes. We also recommend that you wash your Grobag with a detergent that is free from bleaching agents in order to retain the original colours.

When do I stop using a Grobag Baby Sleep Bag?

Grobag Baby Sleep Bags can be used right up to the time your child is ready to move from a cot to a bed, and because of the freedom of movement they allow, they can be used even longer if your child wishes. Even though your toddler will happily stand up in a zipped Grobag, cot-climbing will be far from easy, and your Grobag may well delay the age at which you have to move your child to a bed - a big bonus! Grobags are available for children age 3-6 years who just love them so much, they don't want to say Good-bye! Please note that this size is very generous – so don't consider it until your child has grown out of the 18-36 month size Grobag. We also have 6-10 years size Grobags with double slider zip suitable for older children who aren’t suited to traditional bedding.

What other bedding can I use with my Grobag Baby Sleep Bag?

You should use your Grobag instead of blankets and sheets. The only other bedding required is a bottom sheet. Grobags are designed to replace blankets and sheets. They come in three tog (warmth) ratings for your individual baby and the temperature of your baby’s sleeping place. Duvets, quilts and pillows should not be used for babies under 1 year old and never with a Baby Sleep Bag. The Lullaby Trust recommend that the safest place for your baby to sleep is in a cot or crib in your room for the first six months. However, if your baby shares your bed, make sure he is only in a Grobag, and not under your own bedding as well. Please note that Grobags are designed to replace blankets and sheets in your baby's cot or bed. They are not intended for use as dressing gowns outside the baby's bedroom.

Important: never use your Grobag Baby Sleep Bag with a duvet or quilt.

Why don’t you sell Grobags to last my baby for longer – for example from 6 month to 3 years?

Babies do a great deal of growing between 6 months and 3 years and we don’t believe that it would be responsible to try to manufacture a Baby Sleep Bag that would fit, and be safe for, both a 6 month old baby and a 3 year old toddler. Babies grow at the greatest rate in their first 6 months of life, and then their rate of growth slows down gradually. This is why our youngest size Grobag (0-6m) lasts for 6 months, our next size up (6-18m) lasts for a whole year, and our third size up (18-36m) lasts for a full 1½ years.

Why do I have a Grobag with a label in that says it can be used from 8lbs 8oz in weight?

Before the new British Standard was produced, Grobag Baby Sleep Bags conformed to a Voluntary Code of Practice in the UK which was published by the Baby Products Association in 2005. The recommendations in this code were based on the information available on average babies’ birth weights and head and neck circumferences. The new British Standard working group has made recommendations based on increased average birth weights of babies, and their corresponding average head and neck circumferences and therefore the neck measurements that a Baby Sleep Bag must have in order to conform. Babies come in all shapes and sizes and the most important thing is for you to feel confident that your baby is not in a Baby Sleep Bag which might be too large for him.

Why is the weight of the baby so important for the smaller size Grobag Baby Sleep Bag?

Our key safety consideration is to ensure that babies cannot slip down inside the Baby Sleep Bag. Therefore, we design the neck size to be as large as possible to allow comfort and heat loss, whilst being smaller than the average head circumference of the younger age/lower weight of baby we advise for the Grobag Baby Sleep Bag. We use health professional graphs to link head sizes with weight and this is also in line with the new British Standard for Baby Sleep Bags (BS 8510:2009). Most new parents do not know the head circumference of their babies, but they can keep a track of their weight, hence we use weight as a guide.

You must always take care not to allow your baby's head to slip down and get covered by any bedding, whether that bedding is a Grobag Baby Sleep Bag, blankets or sheets.

When can I first put my baby in a Grobag Baby Sleep Bag?

Our 0-6 months Grobag Baby Sleep Bag can be used for a full-term, 8lb 8oz (4kg) baby from birth. However, if your baby weighs less than 8lb 8oz (4kg) at birth, we recommend you wait a short time, until your baby grows larger. For the first few weeks and for babies under 8lb 8oz (4kg), we recommend the Grobag Swaddle as a safe and easy alternative for your baby. Our 0-6 month size Grobag includes under-arm poppers to reduce the size of the armholes for babies up to 10lbs (4.5kg).

What is the difference between a Grobag and any other Baby Sleep Bag?

Over 90% of new mothers in the UK now use a Baby Sleep Bag and 9 years ago, when Grobags were launched, this figure was less than 2%. At The Gro Company, we are really proud that we have changed the way that the nation puts its babies to bed. But it really does go further than that! When we started Grobag, we not only wanted to give both parents and babies a better and more peaceful night’s sleep, but also a safer night’s sleep. We have worked with, and supported, FSID (Now The Lullaby Trust) since 2001 to help promote safe sleep for babies and to help fund their research. We also follow all the latest research into safe sleep to make sure that not only are our Grobags the best quality and safest possible, but also that the information we provide is the most up-to-date and useful for parents and carers. So when you buy a Grobag you can be sure that:

You are choosing a Baby Sleep Bag that meets all the requirements of the new British Standard (BS 8510:2009)

You are choosing the only Baby Sleep Bag recommended by The Lullaby Trust, the UK’s leading Cot Death Charity

You are choosing a Baby Sleep Bag that has gone through rigorous quality control and testing

You are choosing a Baby Sleep Bag that uses only the highest quality and reliable components such as YKK zips and poppers

You are choosing a Baby Sleep Bag which will be correctly sized for your baby, in line with the new British Standard

You are choosing from the widest range of sizes and togs available

You have a FREE nursery thermometer and instructions to ensure that you know how to use your Grobag safely and correctly

You are choosing a Baby Sleep Bag with 100% natural cotton lining and outer fabric

Yes, it is a registered trademark. We first used European Baby Sleeping Bags in 1997 when our son, Sam, was kicking off his covers, getting cold and keeping us awake all night. Rob coined the name, “Grobag”, and it just stuck! When our daughter, Lucy, was born in 1999 and we decided it was time to spread the word, we started the company “Grobag”, which has since become “The Gro Company”. Of course, now that over 90% of the new mothers in the UK use Baby Sleep Bags, other makes of Baby Sleep Bag are now available, but none can call themselves “Grobag”. We are so proud that we are the parents who changed the way the UK puts their babies to bed. We also remain the market leader in the UK, have won numerous awards, and are proud to retain our core values of safety and quality above all else. Remember, a Baby Sleep Bag by any other name is simply not a Grobag! When you buy a Grobag, we truly believe you have the safest, most tested, best-made and therefore best value Baby Sleep Bag available.

Please tell me about the New British Standard for Baby Sleep Bags?

The new British Standard for Baby Sleep Bags (BS 8510:2009) has been introduced to provide a quality and safety standard for Baby Sleep Bags to conform to in the UK. Together with other industry and technical experts, The Gro Company has been involved with a working group for over two years in order to produce this very important Standard to help parents to be confident that they are buying a safe and high quality Baby Sleep Bag. To meet the new Standard, Baby Sleep Bags must be constructed to specific guidelines and tested in accordance with industry standard testing equipment. BS 8510:2009 has been developed completely with a baby’s safety in mind and some of the requirements are as follows:

Baby Sleep Bags should have armholes, but no sleeves or hoods, to prevent over-heating

The neck openings have both minimum and maximum measurements to ensure safety

Zips, buttons and press studs (poppers) have to pass rigorous tests to ensure strength and durability

Loop labels are not allowed and any embellishments such as embroideries, ribbons and appliqués must pass stringent tests to ensure that they are safe for babies and do not pose risks of choking, entanglement, or entrapment

Shrinkage and colour fastness are also tested to ensure quality and durability

Tests are also undertaken to ensure that no dangerous chemicals are present, for example, in the dyes used in the fabrics, or in fire retarding the Baby Sleep Bags

The Baby Sleep Bag must be labelled properly for the correct age and/or height for the baby

The Baby Sleep Bag should be a low tog (warmth) rating and must be tested and labelled to show the tog rating and the suitable bedroom temperature.

The New British Standard is voluntary, and not all brands of Baby Sleep Bags on sale in the UK will comply. The Gro Company has always produced Baby Sleep Bags with safety and quality as a guiding principle. BS 8510:2009 is based on many of the recommendations in the previous voluntary Code of Practice for Quality and Safety of Baby Sleeping Bags (2005), which we ourselves were involved in drawing up. We have always firmly believed in the utmost importance of producing a Baby Sleep Bag that can be washed time and again, and that is as safe as possible when you are leaving your baby unattended and asleep for up to 12 hours at a time.

Why the free nursery thermometer?

Our FREE nursery thermometer, plus all the other useful information you receive when you buy a Grobag, gives further information on usage and suitable levels of clothing for your baby, and is an ideal help for you and anyone looking after your baby.

Why have you created a 3.5 Tog?

The launch of the Winter Warmer Grobag is based on recent feedback we have had from parents. They have noticed temperatures dropping over the past few winter seasons, with more bursts of extreme weather, and they told us they felt they needed something warmer for those occasions.